Crime scene investigators illuminated what was found at the home of an elderly Davis couple who were allegedly stabbed to death by Daniel Marsh more than a year ago.

Marsh, 17, is charged with the murders of Oliver "Chip" Northup, 87, and his wife Claudia Maupin, 76, who were found in their unlocked Cowell Boulevard condominium the night of April 14, 2013.

Marsh also faces enhancements for lying in wait and torture, according to court documents. He pleaded not guilty by reason of insanity on June 2, allowing a continuance of the long-awaited trial. Though Marsh was 15 at the time of his arrest, he is being tried as an adult.

After officers cleared the scene, discovering two mutilated bodies sprawled across a bed, paramedics arrived to confirm what investigators already knew.

"Two bodies were lying on the bed," Paramedic Ryan Esparza testified Wednesday. "Both were pulseless, and not breathing. The removal of organs from both patients also indicated they were both deceased."

Assistant Chief Deputy District Attorney Michael Cabral showed Esparza a photograph, which Cabral said depicted the bodies soon after the murder. Cabral shielded the graphic photograph from view throughout the proceedings.

Photographs were a recurring theme as the trial entered its second day. Cabral flipped through dozens of photographs of the Davis residence Wednesday, from three separated binders, projecting them one-by-one on a screen for jurors to see.

Meanwhile, Marsh sat quietly beside Johnson, scribbling on a yellow legal pad with the occasional glance into a vacant row of the audience, where his father and sister sat during Tuesday testimony.

Hours after police cleared the scene, investigators arrived to gather evidence, taking pictures and collecting fibers from the master bedroom.

Lauren Hartfield with the Davis Police Department walked through the residence after a search warrant was obtained and Yolo County Coroner's Office staff removed the bodies.

Along with dusting for fingerprints, Hartfield processed the window screen, which Marsh allegedly sliced to gain entry. Cabral carried the large, plastic-wrapped screen into the courtroom, asking Hartfield to unwrap it and show jurors where it was cut.

Hartfield reported she found no prints on the screen frame, but found other prints on windows and countertops. Once the screen was placed back into the plastic, Cabral showed her a photograph of the bed after the bodies were removed, revealing a blood stain.

"It appeared to have been pierced with a sharp object," Hartfield said.

Hartfield was joined by Janet Chaney, a police services specialist with Davis PD, the next morning.

Along with collecting evidence, Chaney investigated whether there was a financial motive to the crime. She called on a number of credit cards found in Maupin's purse, reporting no recent activity.

"Aside from the screen," she said, "there was no evidence anything had been stolen."

Mario Alfaro, an evidence technician with Davis Police, said he found "presumed blood stains" on the walls of the room, reaching onto the floor of the master bathroom.

On the top bedsheet, Alfaro found 57 stab marks, labeling each with a white sticker in the photograph. On the fitted sheet, he found what appeared to be a left hand print pressed into the fabric. The sheets were later sent to the Yolo County Sheriff's Department to dry, "keeping the blood evidence as pristine shape as possible," Alfaro said.

In the days following the initial investigation, Alfaro returned to Cowell Boulevard with another search warrant, and with the coroner's guidance was tasked with locating cutlery.

"At that point there had been an autopsy," Alfaro said. "The doctor told me the type of knife it was. It was at least four inches long, with a non-serrated blade."

Finding a kitchen knife with an undetermined "red substance" on the tip, Alfaro sent it to be evaluated, but detectives later ruled it out as a murder weapon.

Delonda Jones, who worked as a housekeeper for Northup and Maupin for more than 12 years, also testified Wednesday. During the investigation, she walked through the Davis residence, letting officers know if anything was out of place, but nothing was.

According to Jones, the couple would often leave windows open and their doors unlocked, at the Cowell Boulevard condominium as well as a previous residence. Jones repeatedly asked the couple to lock up their home, but they continued to ignore her advice.

"I didn't like coming into the house to an unlocked door," Jones said.